Repeat operation mechanism for power driven typewriters or like machines



2 Sheets-Sheet l W. H. KUPPER REPEAT OPERATION MECHANISM FOR POWERDRIVEN TYPEWRITERS OR LIKE MACHINES Dec. 27, 1955 Filed April 1o, 195sINVENTOR ign/AMM /fz/P/E/ 7 M www ATTORNEYJ` Dec. 27, 1955 w. H. KUPPER2,728,435

REPEAT OPERATION MECHANISM FOR POWER DRIVEN TYPEWRITERS OR LIKE MACHINESFiled April 10, 1953 2 Sheets-Sheet 2 'lllAvllll/Ill//llllllll/lllATTORNEYS` REPEAT OPERATION MECHANISM FOR POWER DRIVEN TYPEWRITERS RLIKE MACHINES William H. Klipper, West Hartford, Conn., assigner toRoyal McBee Corporation, a corporation of New York Application April 10,1953, Serial No. 348,033

14 Claims. (Cl. 19717) This invention relates to repeat operationmechanism for power driven typewriters or like machines, and moreparticularly to repeat operation mechanism in which a power driven,cyclically operable mechanism is arranged to effect repeated operationof other but cooperatively associated power driven mechanism whichoperates a typewriter instrumentality, e. g. a typing member. Theinvention is especially suited for effecting repeat operations of powerdriven actuating mechanism of the general class in which a continuouslyoperating driver is adapted to operate an actuator through theintermediary of an interponent which normally is disconnected from thedriver but which may be moved into transient engagement with the driverfor being driven thereby to effect a single operation of the actuatorand the instrumentality to be operated. In accordance with the presentinvention, a cyclically operable means, which itself is power driven andwhich operates continuously when the typewriter or like machine is inuse, is arranged to effect cyclic connection of the actuator to thedriver.

An object of the present invention is to provide mechanism of the kindreferred to comprising, in a sense, two power driven mechanisms, the rstof which includes a driver, an actuator, an interponent for connectingthe actuator to the driver transiently so as to cause the actuator andassociated typewriter instrumentality to be operated; and the second ofwhich comprises a cyclically operable means, such as a cam, which may beoperated under the control of a suitable key or the like for effectingsuccessive or repeated engagements of the interponent with the driver,with consequent repeated operation of the actuator and instrumentality.

A further object of the invention is to provide repeat operationmechanism which is of improved and simple construction and which mayeasily be adapted to and combined with known or conventional powerdriven typewriters or like machines with a minimum of changing of theexisting machines.

Other objects of the invention will become apparent from a reading ofthe following description, the appended claims, and the accompanyingdrawings, in which:

Figure l is a fore-and-aft vertical sectional view of a power operatedtypewriter embodying the invention, some parts being shown in elevation,and certain conventional typewriter parts being omitted for the sake ofclarity;

Figure 2 s a fragmentary horizontal sectional view on the irregular line2-2 of Figure l, with certain parts omitted;

Figure 3 is a perspective view of a control member or trigger formingpart of a type bar actuating mechanism;

Figure 4 is a perspective view of a lever forming part of a train ofconnections between a repeat key lever and a cyclically operable meanswhich effects repeated operation of mechanism which actuates the typebar;

Figure 5 is a perspective view of one or two brackets for mounting a camfollower shaft;

Figure 6 is a perspective view of the other bracket for mounting the camfollower shaft;

nted States Patentl 2,728,435 Patented Dec. 27, 1955 ICC Figure 7 is aperspective view of a bell crank lever forming part of the means forcontrolling the cyclically operable mechanism;

Figure 8 is a perspective view of a cam follower lever; and

Figure 9 is a schematic or diagrammatic view of driving mechanism forthe cyclically operable means and the type bar operating mechanism.

The invention may be embodied in typewriters or like machines of variouskinds. For the purposes of illustration, the invention is shown as beingembodied in an olice type typewriter having, except for the powergenerating, transmitting and controlling mechanism to be described, manyfeatures in common with the well known Royal Standard typewriter. Thedrawings show only enough of the standard or known typewriterconstruction to assist in illustrating the manner in which mechanismembodying the invention may be coordinated with other parts of atypewriter construction. The known construction illustrated includes amain frame A on which a carriage B equipped with a platen C is mountedfor letter spacing and return movements by means of a top rail 1 securedto and forming part of the carriage, and rolling upon balls 2, which inturn are adapted to roll on a framemounted bottom rail or track 3.

The carriage may be driven toward the left, that is, in theletter-spacing direction, by any suitable mechanism, for example, by aspring barrel and draw band (not shown) of known or suitableconstruction. Carriage returning mechanism may be of the kind disclosedin the United States Patent to Henry I. Hart, No. 2,567,937, issuedSepetmber 18, 1951, or of other suitable kind, preferablypower-operated.

A case shift segment 4 is mounted to shift vertically on the frame A bya construction not shown but which may be of a well known form.Mechanism for shifting the segment i includes a link 5 which is pivotedas at 6 to the segment 4 and which may be operated by power drivenmechanism of the kind disclosed in the United States Patent to WilliamH. Kupper, No. 2,620,056, issued December 2, 1952. As disclosed in thispatent, the case shift mechanism may be operated under the control of aleft shift key 7, or a right shift key lever 8; and may be maintained inupper case position by a shift lock key 9. The keys 7 and 9, and the keylever 8 are pivoted at 10 on a fixed frame crossbar 11. A spring 12interposed between the shift key lever 8 and an anchor plate 13 on aframe cross bar 14 yieldably holds the shift key lever 8 and the shiftkey 7 in normal, raised positions.

The segment 4 is provided with the usual arcuate pivot wire 15 on whichthe vusual complement of typing members, one only of which shown at 16as a front strike type bar, is pivoted. The type bar 16 has a lower casetyping character 16a and an upper case typing character 16u which, inIthe form shown, is an underscoring or underlining character.

ln general, the construction described so' far is of a known kind anddoes not in itself constitute the present invention. The inventionresides in other parts to be described, and the combinations of suchother parts with each other and with the parts described above.

Broadly considered, operation of the type bar 16 is effected bypower-driven means, generally designated D, adapted to be made effectiveby depression of a singlestroke typing control key E, or a repeat stroketyping control key F. The power-`driven mechanism D is generally similarto but embodies improvements in mechanism disclosed in the United StatesPatent to William H. Kupper No. 2,567,945, issued September 18, 1951. Itincludes a driving element, which operates continuously, andcontrollable driving connections, which normally are inoperative orineffective, but which may be conditioned by the operator to effectoperative driving connection between the continuously moving drivingmember and the type bar 16. The driver preferably is constituted by arotatable continuously driven member, more particularly a toothed snatchroll or bar 17, which may be of known form, and which is adapted to bedriven in the direction of the arrow a in the Figure l by any suitablemeans, but preferably by an electric motor M (Figure 9).

The means for transmitting drive from the driver 17 to type bar 16includes an actuator 18 which is pivoted as at 19 to a lever 20 at apoint off-set relatively to the pivotal mounting 21 of the lever 20 on afixed frame cross bar 22. The lever is connected to the type bar 16 by alink 18a and the actuator 18 has a forwardly extending part 23projecting under an abutment or guide plate 24 mounted on the frame A toextend parallel to the snatch roll 17. A spring 25, interposed betweenthe front end of the actuator 17 and the anchor plate 13, yieldablyurges the actuator to rock clockwise, and thus normally maintains theactuator in the position shown in Figure l with its front end part 23bearing against the abutment or guide plate 24. Another abutment 26 isdisposed below the abutment 24, and is slotted Ato receive and guide thelower extremity of the actuator part 23 for sliding movements. The lever26 normally is held in its inactive position, shown in Figure l, by areturning spring 27 interposed between a part (not shown) at the rear ofthe frame A and a wire link 28 pivoted at 29 to the lever 20.

In order to apply a power impulse to the type bar 16, the actuator 18 isoperatively but indirectly connected to the driving member 17, theactuator itself never engaging the driving member. Mechanism forbringing about this operative connection includes an interponent pawlelement 30, pivoted as at 31 on the actuator. A spring 32, anchored tothe actuator 17 and connected to the pawl 30, biases or urges the latterto rock clockwise so as to move its nose into engagement with the snatchroll 17. Normally, the pawl is maintained disengaged from the snatchroll by the restraining action of a control element or trigger 33 whichis pivoted as at 34 on the actuator 18. In the normal position of thecontrol means or trigger, its rear end or nose engages a holding surface35 on the pawl 30 so as to prevent the spring 32 from rocking the pawl30 into drive-transmitting engagement with the driving member 17 Thepawl 30 is formed with an inclined resetter cam face 36 which is locatedjust below the holding surface 35, and which is acted upon by thetrigger nose for rocking the pawl counterclockwise, and thus resettingit in normal, inoperative position.

The mechanism for effecting single operations of the type bar 16includes the key lever E pivoted at 37 on the fixed part 11 of theframe. An upward extension 38 on the rear end of the key lever Eprojects behind the depending arm 39 of a lever 40 pivoted at 41 on theframe cross bar 14. Pivoted at 42 on another arm 43 of the lever 40 is alimber dog or flipper 44 urged clockwise by a spring 45 but limited inits clockwise movement by a stop ear 46 on the lever arm 43. The lowerend of the flipper 44 is disposed above a contact ear 47 on the type baractuator 18. A tension spring 48 interposed between the key lever E andan arm 49 on the lever 40, and a compression spring 50 interposedbetween the lever arm 49 and an anchor plate 51 on the cross bar 14normally maintain the parts in the positions shown in Figure l.

In operation, when the single impression character key lever E isdepressed the lever is rocked clockwise, causing the ipper 44 to engagethe actuator ear 47 and move the actuator 18 downwardly until itsassociated trigger 33 is rocked to pawl-releasing position by engagement with the lower abutment 26. The pawl or interponent 30, having beenthus released, will move into engagement with the snatch roll 17 so asto be driven forwardly together with the actuator 18, thus rocking 4 thelever 20 and actuating the type bar 16 through the link connection 18B.

When the pawl 30 is cast off from engagement with the snatch roll 17,the spring 25 lifts the actuator 18 to bring the trigger 33 intoengagement with the upper, triggerresetting abutment 24. This causes thetrigger 33 to be rocked counterclockwise, so as to move its rear endagainst the resetting cam face 36 of the pawl 30, thereby restoring thelatter to itsinactive position. The type bar 16 and its operatingconnections will then be restored to their normal positions, shown inFigure l, by the spring 27, previously referred to.

Mechanism is provided for effecting automatically repeated operation ofthe power operated mechanism D for causing the type bar 1 6 to perform asuccession of typing strokes when the repeat key lever F is depressedand held down. The key lever F is pivoted at 52 on a fixed frame part 53and is urged clockwise as viewed in Figure l by a spring 54 interposedbetween the rear end portion of the lever F and a stud 55 on the framepart S3. Rocking of the lever F to its normal position under the urge ofthe spring 54 is limited by engagement of a stop part 56 on the leverwith the rear edge of the frame part 53. Countex-clockwise rocking ofthe key F against the urge of the spring 54 for effecting repeatedtypingoperations is limited by engagement of another stop part 57 on thelever with the rear edge of the frame part 53.

The repeat key lever F controls cyclically operable mechanism, generallydesignated G, for effecting repeated movement of the trigger 33 to itsinterponent releasing position, which causes the interponent 30repeatedly to engage the snatch roll 17 so that the actuator 18 and thetype bar 16 will be operated successively a selected number of times,according to the length of time the key lever F is held depressed. Thecyclically operable mechanism G includes a cam 58 mounted on a shaft 59and adapted to be rotated continuously when the typewriting machine isin operation. The cam is formed with two lobes 60-60 spaced degreesapart. Spaced brackets 61 and 62 mount a cam follower shaft 63 to extendparallel to the cam shaft 59. The bracket 61 is secured to the base ofthe typewriter by a screw 64, and the bracket 62 is secured by screws65, 65 to a fixed frame part 66. Ears 67 and 68 respectively on thebrackets 61 and 62 mount the shaft 63 for endwise shifting movement.

A cam follower lever 69 is secured to the shaft 63 and at the upper endof the lower arm 70 of the lever 69 is a cam follower roller 71 adaptedto engage the cam 58. The roller 71 normally is positioned in axiallyoffset relation to the cam 58 Vso as not to be engageable with the cam.For this purpose, a spring 72 is interposed between the ear 68 of thebracket 62 and a collar 73 secured to the cam follower shaft 63, thecompressive loading on the spring 72 tending to hold the shaft 63 in theposition shown in Figure 2 so that the follower roller 71 will notengage the cam 58.

Depression of the repeat key F is utilized to shift the cam followerlever 69 to position the follower roller 71 for engagement with the cam58. For accomplishing this, a wire link 74 is pivoted at its upper endat 75 to the rear end of the key lever F, and is pivoted at its lowerend at 76 to one arm 77 of a lever 78 which is mounted to rock on apivot stud 79 fixed to a stationary frame wall 80. Another arm 81 of thelever 78 is pivoted at 82 to the front end of a rearwardly extendingwire link 83, the rear end of which is pivoted at 84 to an arm 85 of abell crank lever 86 pivoted at 87 on the bracket 62. The other arm 88 ofthe bell crank lever 86 is formed with a round nose 89 which bearsagainst the collar 73 on the cam follower shaft 63.

When the repeat key lever F is depressed, vthe link 74 is raised, andthe lever 78 is rocked clockwise as viewed in Figure l, thereby pullingforwardly on the link 83 and rocking the bell crank lever 86 clockwiseas viewed in Figure 2 so as to move the collar 73 and the follower shaft63 against the urge of the spring 72. cam follower roller 71 in theplane of the cam 58 so that the follower roller 71 will be operated bythe cam.

Cyclic operation of the cam follower lever 69 is utilized for effectingcyclic movement of the trigger 33 to interponent releasing position and'then back to interponent maintaining position. For this purpose, motiontransmitting connections are interposed between the lever 69 and thetrigger 33. In the form shown, an arm 90 on the follower lever 69 ispivoted at 91 to the rear end of a wire link part 92, the forward end ofwhich is pivoted at 93 to an arm 94 fixed to a shaft 95 which is mountedfor rocking movements in the frame part or wall 80 and a similar part orwall 96. Also fixed to the shaft 95 is an arm 97 which is pivoted at 98to the rear end of a link 99, the forward end of which is formed with aslot 100 which receives a pin 101 on a downwardly extending arm 102formed integrally with the trigger 33. A spring 103 interposed betweenthe arm 70 of the follower lever 69 and an ear 164 on the bracket 61urges the cam follower arm 69 to rock clockwise, that is, so as to movethe follower roller 71 toward the cam 58. Movement of the follower armunder the urge of the spring 103 is limited by engagement of a stop ear105 on the lever 94 with the bottom of the frame crossbar 22, as shownin Figure l. Movement of the follower lever 69 counterclockwise whenoperated by the cam 58 may be limited by a stop lug 106 on the bracketi. This prevents overthrowing of the follower lever 69. As previouslyindicated, both the snatch roll 17 and the cam 68 rotate continuouslywhen the typewriter is in operation. Preferably, the snatch roll 17 andcam 58 are driven from the same source of power, for example, a singleelectric motor M. The motor M may be connected to the snatch roll 17 andthe cam 58 in any suitable manner, for example, by mechanism of thegeneral class shown in Figure 9 in which the motor M is equipped with adriving pulley 197 which operates a belt 108 trained around a pulley109. The pulley 109 is fast with a smaller pulley 110 which drives abelt 111 passing around a pulley 112 fast with the shaft 59. Also fastwith the shaft 59 is a pulley 113 which drives a belt 114 and a pulley115 secured to the snatch roll 17.

This will place the Operation When it is desired to effect a singleoperating stroke of the type bar 16, the typing key E is depressed so asto lower the actuator 18, move the trigger 33 to its releasing position,and thereby enable the interponent 36 to be engaged with the snatch roll17. The snatch roll 17 will then drive the interponent 30, the actuator18, the lever 20, the link 18a, andthe type bar 16 in a manner now wellknown in the art. When the interponent 30 has been cast olf fromengagement with the snatch roll 17, the parts will return to theirnormal positions, thus completing a single operating cycle. The lostmotion connection 100- 101 enables the trigger 33 to be operated undercontrol of the key E without being interfered with by the link 99 whichremains stationary when single typing operations are being performed bydepressing the key E.

When it is desired to effect a succession of operations of the type bar16, for example for underlining purposes, the shift mechanism may beoperated to lower the type bar segment 4 so that printing strokes of thetype bar 16 will bring the underscoring character i6b to printingposition. The manually manipulatable repeat key lever F is depressed andheld down so as to raise the link 74, rock the lever 78 clockwise, pull.the link 83 forwardly, rock the lever 86 clockwise as viewed in Figure2, and move the shaft 63 and cam follower. lever 69 so as to place thecam follower roller 71 in the plane of the cam 58. During each rotationof the cam 58am the direction of the arrow b, there will be twomovements of the follower lever 69 by the cam lobes 60,1 causing thelever 69 to rock counter-clockwise as viewed-in Figure l therebypushingforwardly on the link 92 and rocking the arm 94, the shaft 95,and the arm 97 clockwise. This will thrust the link 99 forwardly,causing the rear end of the slot 100 in the link 99 to push against thepin 101 on the downward extension 102 of the trigger 33, thereby rockingthe trigger clockwise about its pivot 34 into its interponent releasingpoosition. The spring 32 will then move the interponent into engagementwith the snatch roll 17, causing the interponent 30 and the actuator 18to be driven forwardly by the snatch roll 17 with resultant performanceof a typing stroke by the type bar 16. When the typing stroke has beencompleted, the interponent 30 and the actuator 18 will be returned totheir normal positions. When the interponent 30 and actuator 18 arebeing driven forwardly by the snatch roll 17 the trigger 33 will bemoved forwardly to an extent greater than the forward movement of thelink 99 which previously moved the trigger 33 to its interponentreleasing position. Consequently, the pin 101 on the trigger 33 willmove forwardly in the slot 100 in the link 99 without being restrainedby the link 99. Thus, the lost motion pin-and-slot connection 100-101between the link 99 and the trigger 33 enables the trigger to beoperated by the cam follower and enables it to be moved by the snatchroll beyond the position to which it has been operated by the camfollower.

After the parts 0f the power operated driving mechanism D have returnedto their normal positions, the cam follower roller 71 will again beengaged by a cam lobe 60, and the cycle of operations described abovewill be repeated. Any selected number of successive or repeatedoperations of the type bar 16 may be effected by holding the repeat keylever F depressed for an appropriate time.

The invention has been described in connection with mechanism foroperating a printing member instrumentality; but it will be understoodthat the invention is applicable for use in operating other typewritermechanisms or instrumentalities in which repeat operations may bedesirable, such for example as back spacing mechanism, letter spacingmechanism, and line spacing mechamsm.

The mechanism disclosed embodies the invention in a preferred andpractical form, but it is intended that the disclosure be illustrativerather than definitive. The invention is defined in the appended claims.

I claim:

l. ln a typewriter or like machine, an instrumentality to be operated; acontinuously running power operated driver; connections between saidinstrumentality and said driver including an interponent connected tosaid instrumentality and normally being disengaged from said driver butbeing transiently engageable therewith and movable thereby for impartingan operating stroke to said'instrumentality; control means normallypreventing engagement of said interponent with said driver andcomprising a control element operable for effecting transient engagementof said interponent with said driver; a continuously running cam;connections between said cam and said control element including a camfollower normally so positioned relatively to said cam as not to beoperable thereby but being adapted to be so positioned relatively tosaid cam as to be operable thereby; and means for positioning saidfollower relatively to said cam so as to be operated thereby a selectednumber of times with consequent repeated engagement of said interponentwith said driver and repeated operation of said instrumentality.

2. In a typewriter or like machine, an instrumentality to be operated; apower operated driver; connections betweenfsaid instrumentality and saiddriver including an inte oneitt connected to said instrumentality andnormally b isengaged from said driver but being transiently en 1g bletherewith and movable thereby for imparting an ating stroke to saidinstrumentality; control means no1-nja y preventing lengagement of saidinterponent with said driver and comprising a control element operablefor effecting transient engagement of said interponent with said driver;a rotatable, power driven cam; connections between said cam and saidcontrol element including a cam follower; means mounting said camfollower to enable it to be shifted from a normal position in which itis not engageable with said cam to an operating position in which it isengageable with said cam; and manipulatable means for shifting said camfollower into and holding it in its said operating postion, wherebythere will ensue repeated operation of said cam iollower and saidcontrol element with consequent repeated engagement of said interponentwith said driver and rcpeated operating strokes of said instrumentalityv3. In a typewriter or like machine, an instrumentality to be operated; apower operated driver; connections between said instrumentality and saiddriver including an interponent connected to said instrumentality andnormally being disengaged from said driver but being transientlyengageable therewith and movable thereby for imparting an operatingstroke to said instrumentality; control means normally preventingengagement of said interponent with said driver and comprising a controlelement operable for effecting transient engagement of said interponentwith said driver; a rotatable power driven cam; connections between saidcam and said control element including a cam follower; a shaft on whichsaid cam follower is mounted; means mounting said shaft to move to shiftsaid cam follower from a normal position in which it is not engageablewith said cam to an operating position in which said cam follower isengageable with said cam; means yieldably urging said shaft to maintainsaid cam follower in its said normal position; and manipulatable meansfor moving said shaft to shift said cam follower into and maintain it inits said operating position, whereby there will ensue repeated operationof said cam follower and said control element with consequent repeatedengagement of said interponent with said driver and repeated operatingstrokes of said instrumentality.

4. In a typewriter or like machine, an instrumentality to be operated; apower operated driver; connections between said instrumentality and saiddriver including an interponent connected to said instrumentality andnormally being disengaged from said driver but being transientlyengageable therewith and movable thereby for imparting an operatingstroke to said instrumentality; control means normally preventingengagement of said interponent with said driver and comprising a controlelement operable for effecting transient engagement of said interponentwith said driver; a cyclically operable cam; a cam follower normally sopositioned relatively to said cam as not to be operable thereby; motiontransmitting means including a lost motion connection between said camfollower and said control element; and means for elfecting such relativepositioning of said cam and cam follower as to cause said cam followerto be Operated by said cam a selected number of cycles thereby to effecta corresponding number of successive operations of said control eiementwith consequent repeated engagement of said interponent with said driverand repeated operation of said instrumentality.

5. In a typewriter or like machine, an instrumentality to be operated; acontinuously running power operated driver; connections between saidinstrumentality and said driver including an interponent connected tosaid instrumentality and normally being disengaged from said driver butbeing transiently engageable therewith and movable thereby for impartingan operating stroke to said instrumentality; control means normallypreventing engagement of said interponent with said driver andcomprising a control element operable for electing transient engagementof said interponent with said driver; a continuously running cam; motiontransmitting means between said cam and said control element including acam follower normally so positioned relatively to said eam as not to beoperable thereby but being adapted to be so positioned relatively tosaid cam as to be operable thereby, a link connected to said camfollower, and a lost motion connection between said link and saidcontrol element; and means for positioning said follower relatively tosaid cam so as to be operated thereby a selected number of times withconsequent repeated engagement of said interponent with said driver andrepeated operation of said instrumentality.

6. In a typewriter or like machine, an instrumentality to be operated; apower operated driver; connections between said instrumentality and saiddriver including an interponent connected to said instrumentality andnormally being disengaged from said driver but being transientlyengageable therewith and movable thereby for imparting an operatingstroke to said instrumentality; control means normally preventingengagement of said interponent with said driver and comprising a controlelement operable for effecting transient engagement of said interponentwith said driver; a rotatable, power driven cam; motion transmittingmeans between said cam and said control element including a camfollower, a link connected to said cam follower, and a pin-and-slot lostmotion connection between said link and said control element; meansmounting said cam follower to enable it to be shifted from a normalposition in which it is not engageable with said cam to an operatingposition in which it is engageable with said cam; and manipulatablemeans for shifting said cam follower into and holding it in its saidoperating position, whereby there will ensue repeated operation of saidcam follower and said control element with consequent repeatedengagement of said interponent with said driver and repeated operatingstrokes of said instrumentality.

7. In a typewriter or like machine, a typing member;V

a power operated driver; connections between said typing member and saiddriver including an interponent connected to said typing member andnormally being disengaged from said driver but being transientlyengageable therewith and movable thereby for imparting an operatingstroke to said typing member; control means normally preventingengagement of said interponent with said driver and comprising a controlelement operable for effecting transient engagement of said interponentwith said driver; a rotatable, power driven cam; connections betweensaid cam and said control element including a cam follower; meansmounting said cam follower to enable it to be shifted from a normalposition in which it is not engageable with said cam to an operatingposition in which it is engageable with said cam; and manipulatablemeans for shifting said cam follower into and holding it in its saidoperating position, whereby there will ensue repeated operation of saidcam follower and said control element with consequent repeatedengagement of said interponent with said driver and repeated operatingstrokes of said typing member.

8. In power operating mechanism for a typewriter or like machine, aninstrumentality to be operated; a power operated driver; an actuator;means connecting said actuator to said instrumentality; an interponentmounted on said actuator for movements into and ont of operativeengagement with said driver and being biased to move from a normalposition in which it is disengaged from said actuator into an operativeposition in which it engages said actuator; a trigger normallymaintaining said interponent in its said normal position but beingmovable from its interponent maintaining position into an interponentreleasing position for enabling the bias on said interponent to movesaid interponent into transient engagement with said driver thereby toenable said driver to operate said interponent, said actuator, saidconnecting means, and said instrumentality; means for then returningsaid interponent, said actuator, said connecting means, saidinstrumentality and said trigger to their normal positions; a cyclieallyoperable sain.; :a follower normally so positioned relatively to saidcam., as not to be operable thereby; connections between said ,camfollower and said trigger; and means for effecting suchrelativepositioning of said cam and cam follower as to cause said cam followerto be operated by said cam a selected number of cycles thereby to effecta corresponding number of cycles of successive movements of said triggerfrom its interponent maintaining position to its. interponent releasingposition and from its interponent releasing position to its interponentmaintaining position with consequent repeated engagement of saidinterponent with said driver and repeated operation of s aid`instrumentality.

9. In power operating mechanism for a typewriter or like machine, aninstrumentality to be operated; a power operated driver; an actuator;means connecting said actuator to said instrumentality; an interponentmounted on said actuator for movements into and outl o f operativeengagement with said driver and being biased to move from a normalposition in which .it .iS disengaged from said actuator into anoperative position in which it-.engages said actuator; a triggernormally maintainingl said interponent in its said normal position butbeing movable from` its interponent maintaining position into aninterponent releasing position for enabling the bias on said interponentto move said interponent into transient engagement with said driverthereby to enable said driver to operate said interponent, saidactuator, said Connecting means, and said instrumentality;Y means forthen returning said interponent, said actuator, said connecting means,said instrumentality and said trigger to their normal positions; arotatable power driven cam; connections, between said cam and saidtrigger including a cam follower; means mounting said cam follower toenable it to be shifted from a normal position in which it is notengageable with said cam to an operating position in which it isengageable with said cam; and manually operable means for shifting saidcam follower into and holding it in its said operating position, wherebythere will ensue repeated operation of said cam follower and saidtrigger, repeated releasing of said interponent for engagement thereofwith said driver, and consequent repeated operation of said actuator andsaid instrumentality.

l0. In power operating mechanism for a typewriter or like machine, aninstrumentality to be operated; a power operated driver; an actuator;means connecting said actuator to said instrumentality; an interponentmounted on said actuator for movements into and out of operativeengagement with said driver and being biased to move from a normalposition in which it is disengaged from said actuator into an operativeposition in which it engages said actuator; a trigger normallymaintaining said interponent in its said normal position but beingmovable from its interponent maintaining position into an interponentreleasing position for enabling the bias on said interponent to movesaid interponent into transient engagement with said driver thereby toenable said driver to operate said interponent, said actuator, saidconnecting means, and said instrumentality; means for then returningsaid interponent, said actuator, said connecting means, saidinstrumentality and said trigger to their normal positions; a rotatablepower driven cam; connections between said cam and said triggerincluding a cam follower; a shaft on which said cam follower is mounted;means mounting said shaft for endwise movement to shift said camfollower from a normal position in which it is not engageable with saidcam to an operating position in which said cam follower is engageablewith said cam; means yieldably urging said shaft to maintain said camfollower in its said normal position; and manipulatable means for movingsaid shaft endwise to shift said cam follower into and maintain it inits said operating position, whereby there will ensue repeated operationof said cam follower and said trigger, repeated releasing of 1'0 saidinterponent for. engagement. thereof. with .Said driver, and ,consequentrepeated operation of said actuator and said instrumentality- 1l. Inpower operating mechanism for a typewriter or like machine, aninstrumentality to be operated; a power operated driver; an actuator;means connecting said actuator to said instrumentality; an interponentmounted on said actuator for movements into and out of operativeengagement with said driver and being biased to move from a normalposition in which lit is disengaged from said actuator into an`operative position in which it engages said actuator; a triggernormally maintaining said interponent in its said normal position butbeing movable from rits interponent maintaining position into aninterponent releasing position for enabling the bias on said interponentto move said interponent into transient engagement with said driverthereby to eanble said driver to operate said interponent, said`actuator, said connecting means, and said instrumentality; moans forthen returning-said interponent, said actuator, said connecting means,said instrumentality and said trigger to their normal positions; acyclicallv operable cam; a cam follower normally so `positionedrelatively to said cam as not to be operable thereby; motiontransmitting means including a lost motion connection between said camfollower and said trigger; and means for effecting such relativepositioning of `said cam and cam follower as to cause said cam followerto be operated by said cam a selected number of cycles thereby toeffectV a corresponding number of cycles of Successive movements of saidtrigger from its interportent `maintain-ing `position to vitsinterponent releasing position and from its interponent releasingposition to its interponent maintaining position with consequentrepeated engagement of Said interponent with said driver and repeatedoperation of. said instrumentality l2. In power operating mechanism fora typewriter or like machine, an instrumentality to be operated; a poweroperated driver; an actuator; means connecting said actuator to saidinstrumentality; an interponent mounted on said actuator for movementsinto and out of operative engagement with said driver and being biasedto move from a normal position in which it is disengaged from saidactuator into an operative position in which it engages said actuator; atrigger mounted on said actuator to move therewith and relativelythereto and normally maintaining said interponent in its said normalposition but being movable relatively to said actuator from itsinterponent maintaining position into an interponent releasing positionfor enabling the bias on said interponent to move said interponent intotransient engagement with said driver thereby to enable said driver tooperate said interponent, said actuator, said connecting means, and saidinstrumentality; means for then returning said interponent, saidactuator, said connecting means, said instrumentality and said triggerto their normal positions; a cyclically operable cam; a cam followernormally so positioned relatively to said cam as not to be operablethereby; connections between said cam follower and said trigger; andmeans for effecting such relative positioning of said cam and camfollower as to cause said cam follower to be operated by said cam aselected number of cycles thereby to effect a corresponding number ofcycles of successive movements of said trigger from its interponentmaintaining position to its interponent releasing position and from itsinterponent releasing position to its interponent maintaining positionwith consequent repeated engagement of said interponent with said driverand repeated operation of said instrumentality.

13. In power operating mechanism for a typewriter or like machine, aninstrumentality to be operated; a power operated driver; an actuator;means connecting said actuator to said instrumentality; an interponentmounted on said actuator for movements into and out of operativeengagement with said driver and being biased to move from a normalposition in which it is disengaged from said actuator into anloperativelposition in which it engages said actuator; a trigger mountedon said actuator to move therewith and relatively thereto and normallymaintaining said interponent in its said normal position but beingmovable relatively to said actuator from its interponent maintainingposition into an interponent releasing position for enabling the bias onsaid interponent to move said interponent into transient engagement withsaid driver thereby to enable said driver to operate said interponent,said actuator', said connecting means, and said instrumentality; meansfor then returning said interponent, said actuator, said connectingmeans, said instrumentality and said trigger to their normal positions;a cyclically operable cam; a cam follower normally so4 positionedrelatively to Asaid cam as not tobe operable thereby; connectionsbetween said cam follower and said trigger including a part operable bysaid cam follower, and a pin-and-slot lost motion connection betweensaid part and said trigger; and means for eifecting such relativepositioning of said cam and cam follower as to cause said cam followerto be operated by said cam a selected number of cycles thereby to effecta corresponding number of cycles of successive movements of said triggerfrom its interponent maintaining position to its interponent releasingposition and from its interponent releasing position to its interponentmaintaining position with consequent repeated engagement of saidinterponent with said driver and repeated operation of saidinstrumentality.

14. In power operating mechanism for a typewriter or like machine, atyping member; a power operated driver; an actuator; means connectingsaid actuator to said typing member; an interponent mounted on saidactuator for movements into and out of operative engagement with saiddriver and being biased to move from a normal position in which it isdisengaged from said actuator into an operative position in which itengages said actuator; a trigger normally maintaining said interponentin its said normal position but being movable from its interponentmaintaining position into an interponent releasing position for enablingthe bias on said interponent to move said interponent into transientengagement with said driver thereby to enable said driver to operatesaid interponent, said actuator, said connecting means, and said typingmember; means for then returning said interponent, said actuator, saidconnecting means, said typing member and said trigger to their normalpositions; a cyclically operable cam; a cam follower normally sopositioned relatively to said cam as not to be operable thereby;connections between said cam follower and said trigger; and means foreffecting such relative positioning of said cam and cam follower as tocause said cam follower to be operated by said cam a selected number ofcycles thereby to eiect a corresponding number of cycles of successivemovements of lsaid trigger from its interponent maintaining position toits interponent releasing position and from its interponent releasingposition to its interponent maintaining position with consequentrepeatedengagement of said interponent with said driver and repeated operationof said typing member.

References Cited in the iile of this patent UNITED STATES PATENTS1,777,056 Thompson Sept. 30, 1930 1,945,836 YThompson Feb. 6,1934

2,387,078 Kurowski Oct. 16,1945

' u l FOREIGN PATENTS 288,395 Y Germany lune 11, 1914

